Nmmm, Not the OP, but the following demonstrates the issue described.

When the input is described as commonmark, all is well. Otherwise, turning 
off raw-tex support may be what the OP want.

╰─► pandoc --version
pandoc 2.14.2
Compiled with pandoc-types 1.22, texmath 0.12.3.1, skylighting 0.11,
citeproc 0.5, ipynb 0.1.0.1
User data directory: C:\Users\micro\AppData\Roaming\pandoc
Copyright (C) 2006-2021 John MacFarlane. Web:  https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.

╰─► echo " aa \a\a \aa bb " | pandoc -f markdown -t html
<p>” aa bb ”</p>

╰─► echo " aa \a\a \aa bb " | pandoc -f commonmark -t html
<p>" aa \a\a \aa bb "</p>

╰─► echo " aa \a\a \aa bb " | pandoc -f markdown-raw_tex -t html
<p>” aa \a\a \aa bb ”</p>

-- 
Rik
On Thursday, September 16, 2021 at 12:43:07 PM UTC-4 John MacFarlane wrote:

>
> Perhaps you could use the permalink feature on the dingus to give
> us a specific example? I tried \a\b and it worked fine. But
> perhaps you're using some non-latin characters?
>
> Jiashu Zou <zjs...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > This behavior does not comply with the CommonMark spec. You can check at 
> > the commonmark.js demo https://spec.commonmark.org/dingus/
> >
> > On Thursday, 16 September 2021 at 17:56:54 UTC+8 Jiashu Zou wrote:
> >
> >> alphabetic characters preceded by backslash (\) are ignored when 
> >> converting from markdown to html. Where is this behavior documented? Is 
> it 
> >> possible to change?
>

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